The period of 2010 to 2014 marked a relatively stable stage in the evolving quality assurance system for Ontario postsecondary education, particularly following massive changes after 2000. The current system consists of three frameworks overseen respectively by three quality assurance agencies--the Ontario Universities Council on Quality Assurance, the Ontario College Quality Assurance Service, and the Postsecondary Education Quality Assessment Board, each serving different purposes. This paper uses van Vught and Westerheijden's (1994) general model of quality assessment and Jeliazkova and Westerheijden's (2002) Phase Model of quality assurance systems development as heuristic tools for the analysis. The following four areas are discussed: formalized quality mechanisms with diversity; the arms-length tripartite relationship with a distinction between self-regulation and government regulation; mixed phases of quality assurance development and the maturing process; and gaps in the system. It is argued that within fifteen years, a comprehensive and relatively mature quality assurance system with diverse but rigorous mechanisms has been developed for Ontario postsecondary education although a few deficiencies exist, including the continued lack of coordination within the system. The evolution of the system appears to reflect a path trajectory of governance structure development of the Ontario postsecondary education system as well as be a result of interactions between the local and the global.